Sealing device and camshaft adjuster

Abstract

A sealing device ( 12 ) for a camshaft adjuster ( 1 ) which is driveable using a belt and has a distributing valve ( 8 ) with a piston, wherein the sealing device ( 12 ) has a first securing portion ( 13 ) rigidly arrangeable on the camshaft adjuster ( 1 ), a second securing portion ( 14 ) rigidly arrangeable on the piston side, and a flexible membrane portion ( 15 ) arranged between the first securing portion ( 13 ) and the second securing portion ( 14 ), and a camshaft adjuster ( 1 ) having a having a stator ( 3 ) which, based on a combustion engine, is driveable using a belt, and a rotor ( 4 ) with limited twistability relative to the stator ( 3 ), wherein a twisting can be effected hydraulically, and a distributing valve ( 8 ) with a piston for the purpose of freeing up or blocking the pathway for a hydraulic medium or altering a through-flow direction, wherein the camshaft adjuster ( 1 ) has a sealing device ( 12 ) of the type whose first securing portion ( 13 ) is rigidly arranged on the camshaft adjuster ( 1 ) and whose second securing portion ( 14 ) is rigidly arranged on the piston side.

The invention claimed is:  
     
       1. A sealing device ( 12 ) for a camshaft adjuster ( 1 ), which is driveable using a belt and has a distributing valve ( 8 ) with a piston, characterised in that the sealing device ( 12 ) has a first securing portion ( 13 ) rigidly arrangeable on the camshaft adjuster ( 1 ), a second securing portion ( 14 ) rigidly arrangeable on a piston side, and a flexible membrane portion ( 15 ) arranged between the first securing portion ( 13 ) and the second securing portion ( 14 ). 
     
     
       2. A sealing device ( 12 ) according to  claim 1 , characterised in that the sealing device ( 12 ) has a fixed outer ring and a fixed inner ring. 
     
     
       3. A sealing device ( 12 ) according to  claim 2 , characterised in that the membrane portion ( 15 ) has a bead shape. 
     
     
       4. A camshaft adjuster ( 1 ) according to  claim 2 , characterised in that the sealing device ( 12 ) is pressed into the camshaft adjuster with its first securing portion ( 13 ) and on the piston side is pressed on with its second securing portion ( 14 ). 
     
     
       5. A camshaft adjuster ( 1 ) according to  claim 2 , characterised in that the camshaft adjuster ( 1 ) has a locking disc ( 5 ) and the first securing portion ( 13 ) of the sealing device ( 12 ) is pressed into the locking disc ( 5 ). 
     
     
       6. A camshaft adjuster ( 1 ) according to  claim 2 , characterised in that the camshaft adjuster ( 1 ) has a piston rod ( 10 ) movement-transmittingly connected to the piston, and the second securing portion of the sealing device ( 12 ) is pressed onto a piston rod ( 10 ). 
     
     
       7. A sealing device ( 12 ) according to  claim 2 , characterised in that the outer ring and the inner ring are connected to the flexible membrane portion ( 15 ) in an injection moulding process. 
     
     
       8. A sealing device ( 12 ) according to  claim 7 , characterised in that the membrane portion ( 15 ) has a bead shape. 
     
     
       9. A camshaft adjuster ( 1 ) according to  claim 7 , characterised in that the sealing device ( 12 ) is pressed into the camshaft adjuster with its first securing portion ( 13 ) and on the piston side is pressed on with its second securing portion ( 14 ). 
     
     
       10. A sealing device ( 12 ) according to  claim 1 , characterised in that the flexible membrane portion ( 15 ) has a bead shape. 
     
     
       11. A camshaft adjuster ( 1 ) according to  claim 10 , characterised in that the sealing device ( 12 ) is pressed into the camshaft adjuster with its first securing portion ( 13 ) and on the piston side is pressed on with its second securing portion ( 14 ). 
     
     
       12. A camshaft adjuster ( 1 ) having a stator ( 3 ) which, based on a combustion engine, is driveable using a belt, and a rotor ( 4 ) with limited twistability relative to the stator ( 3 ), wherein a twisting is effected hydraulically, and a distributing valve ( 8 ) with a piston for the purpose of freeing or blocking the path of a hydraulic medium or altering a through-flow direction, characterised in that the camshaft adjuster ( 1 ) has a sealing device ( 12 ) according to at least one of the preceding claims, the first securing portion ( 13 ) of which is rigidly arranged on the camshaft adjuster ( 1 ) and the second securing portion ( 14 ) of which is rigidly arranged on the piston side. 
     
     
       13. A camshaft adjuster ( 1 ) according to  claim 12 , characterised in that the sealing device ( 12 ) is pressed into the camshaft adjuster with its first securing portion ( 13 ) and on the piston side is pressed on with its second securing portion ( 14 ). 
     
     
       14. A camshaft adjuster ( 1 ) according to  claim 12 , characterised in that the camshaft adjuster ( 1 ) has a locking disc ( 5 ) and the first securing portion ( 13 ) of the sealing device ( 12 ) is pressed into the locking disc ( 5 ). 
     
     
       15. A camshaft adjuster ( 1 ) according to  claim 12 , characterised in that the camshaft adjuster ( 1 ) has a piston rod ( 10 ) movement-transmittingly connected to the piston, and the second securing portion of the sealing device ( 12 ) is pressed onto the piston rod ( 10 ). 
     
     
       16. A camshaft adjuster ( 1 ) according to  claim 12 , characterised in that a piston rod ( 10 ) passes through the sealing device ( 12 ) and is mechanically impingable using an actuator ( 9 ). 
     
     
       17. A camshaft adjuster ( 1 ) according to  claim 1 , characterised in that the sealing device ( 12 ) is pressed into the camshaft adjuster with its first securing portion ( 13 ) and on the piston side is pressed on with its second securing portion ( 14 ). 
     
     
       18. A camshaft adjuster ( 1 ) according to  claim 1 , characterised in that the camshaft adjuster ( 1 ) has a locking disc ( 5 ) and the first securing portion ( 13 ) of the sealing device ( 12 ) is pressed into the locking disc ( 5 ). 
     
     
       19. A camshaft adjuster ( 1 ) according to  claim 1 , characterised in that the camshaft adjuster ( 1 ) has a piston rod ( 10 ) movement-transmittingly connected to the piston, and the second securing portion of the sealing device ( 12 ) is pressed onto a piston rod ( 10 ). 
     
     
       20. A camshaft adjuster ( 1 ) according to  claim 1 , characterised in that a piston rod ( 10 ) passes through the sealing device ( 12 ) and is mechanically impingable using an actuator ( 9 ).